<?xml version="1.0" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>RSA_meth_new</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<link rev="made" href="mailto:" />
</head>

<body>



<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#HISTORY">HISTORY</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<h1 id="NAME">NAME</h1>

<p>RSA_meth_get0_app_data, RSA_meth_set0_app_data, RSA_meth_new, RSA_meth_free, RSA_meth_dup, RSA_meth_get0_name, RSA_meth_set1_name, RSA_meth_get_flags, RSA_meth_set_flags, RSA_meth_get_pub_enc, RSA_meth_set_pub_enc, RSA_meth_get_pub_dec, RSA_meth_set_pub_dec, RSA_meth_get_priv_enc, RSA_meth_set_priv_enc, RSA_meth_get_priv_dec, RSA_meth_set_priv_dec, RSA_meth_get_mod_exp, RSA_meth_set_mod_exp, RSA_meth_get_bn_mod_exp, RSA_meth_set_bn_mod_exp, RSA_meth_get_init, RSA_meth_set_init, RSA_meth_get_finish, RSA_meth_set_finish, RSA_meth_get_sign, RSA_meth_set_sign, RSA_meth_get_verify, RSA_meth_set_verify, RSA_meth_get_keygen, RSA_meth_set_keygen, RSA_meth_get_multi_prime_keygen, RSA_meth_set_multi_prime_keygen - Routines to build up RSA methods</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> <span class="comment">#include &lt;openssl/rsa.h&gt;</span>
 
 <span class="variable">RSA_METHOD</span> <span class="variable">*RSA_meth_new</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">char</span> <span class="variable">*name</span><span class="operator">,</span> <span class="keyword">int</span> <span class="variable">flags</span><span class="operator">);</span>
 <span class="variable">void</span> <span class="variable">RSA_meth_free</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">);</span>
 
 <span class="variable">RSA_METHOD</span> <span class="variable">*RSA_meth_dup</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">);</span>
 
 <span class="variable">const</span> <span class="variable">char</span> <span class="variable">*RSA_meth_get0_name</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set1_name</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">char</span> <span class="variable">*name</span><span class="operator">);</span>
 
 <span class="keyword">int</span> <span class="variable">RSA_meth_get_flags</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_flags</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">,</span> <span class="keyword">int</span> <span class="variable">flags</span><span class="operator">);</span>
 
 <span class="variable">void</span> <span class="variable">*RSA_meth_get0_app_data</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set0_app_data</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">,</span> <span class="variable">void</span> <span class="variable">*app_data</span><span class="operator">);</span>
 
 <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*RSA_meth_get_pub_enc</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">))(</span><span class="keyword">int</span> <span class="variable">flen</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*from</span><span class="operator">,</span>
                                                     <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*to</span><span class="operator">,</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span> <span class="keyword">int</span> <span class="variable">padding</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_pub_enc</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*rsa</span><span class="operator">,</span>
                          <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*pub_enc</span><span class="operator">)(</span><span class="keyword">int</span> <span class="variable">flen</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*from</span><span class="operator">,</span>
                                         <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*to</span><span class="operator">,</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span>
                                         <span class="keyword">int</span> <span class="variable">padding</span><span class="operator">));</span>
 
 <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*RSA_meth_get_pub_dec</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">))</span>
     <span class="operator">(</span><span class="keyword">int</span> <span class="variable">flen</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*from</span><span class="operator">,</span>
      <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*to</span><span class="operator">,</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span> <span class="keyword">int</span> <span class="variable">padding</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_pub_dec</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*rsa</span><span class="operator">,</span>
                          <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*pub_dec</span><span class="operator">)(</span><span class="keyword">int</span> <span class="variable">flen</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*from</span><span class="operator">,</span>
                                         <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*to</span><span class="operator">,</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span>
                                         <span class="keyword">int</span> <span class="variable">padding</span><span class="operator">));</span>
 
 <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*RSA_meth_get_priv_enc</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">))(</span><span class="keyword">int</span> <span class="variable">flen</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*from</span><span class="operator">,</span>
                                                      <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*to</span><span class="operator">,</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span>
                                                      <span class="keyword">int</span> <span class="variable">padding</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_priv_enc</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*rsa</span><span class="operator">,</span>
                           <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*priv_enc</span><span class="operator">)(</span><span class="keyword">int</span> <span class="variable">flen</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*from</span><span class="operator">,</span>
                                           <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*to</span><span class="operator">,</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span> <span class="keyword">int</span> <span class="variable">padding</span><span class="operator">));</span>
 
 <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*RSA_meth_get_priv_dec</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">))(</span><span class="keyword">int</span> <span class="variable">flen</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*from</span><span class="operator">,</span>
                                                      <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*to</span><span class="operator">,</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span>
                                                      <span class="keyword">int</span> <span class="variable">padding</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_priv_dec</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*rsa</span><span class="operator">,</span>
                           <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*priv_dec</span><span class="operator">)(</span><span class="keyword">int</span> <span class="variable">flen</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*from</span><span class="operator">,</span>
                                           <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*to</span><span class="operator">,</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span> <span class="keyword">int</span> <span class="variable">padding</span><span class="operator">));</span>
 
 <span class="regex">/* Can be null */</span>
 <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*RSA_meth_get_mod_exp</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">))(</span><span class="variable">BIGNUM</span> <span class="variable">*r0</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">BIGNUM</span> <span class="variable">*i</span><span class="operator">,</span>
                                                     <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span> <span class="variable">BN_CTX</span> <span class="variable">*ctx</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_mod_exp</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*rsa</span><span class="operator">,</span>
                          <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*mod_exp</span><span class="operator">)(</span><span class="variable">BIGNUM</span> <span class="variable">*r0</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">BIGNUM</span> <span class="variable">*i</span><span class="operator">,</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span>
                                         <span class="variable">BN_CTX</span> <span class="variable">*ctx</span><span class="operator">));</span>
 
 <span class="regex">/* Can be null */</span>
 <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*RSA_meth_get_bn_mod_exp</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">))(</span><span class="variable">BIGNUM</span> <span class="variable">*r</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">BIGNUM</span> <span class="variable">*a</span><span class="operator">,</span>
                                                        <span class="variable">const</span> <span class="variable">BIGNUM</span> <span class="variable">*p</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">BIGNUM</span> <span class="variable">*m</span><span class="operator">,</span>
                                                        <span class="variable">BN_CTX</span> <span class="variable">*ctx</span><span class="operator">,</span> <span class="variable">BN_MONT_CTX</span> <span class="variable">*m_ctx</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_bn_mod_exp</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*rsa</span><span class="operator">,</span>
                             <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*bn_mod_exp</span><span class="operator">)(</span><span class="variable">BIGNUM</span> <span class="variable">*r</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">BIGNUM</span> <span class="variable">*a</span><span class="operator">,</span>
                                               <span class="variable">const</span> <span class="variable">BIGNUM</span> <span class="variable">*p</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">BIGNUM</span> <span class="variable">*m</span><span class="operator">,</span>
                                               <span class="variable">BN_CTX</span> <span class="variable">*ctx</span><span class="operator">,</span> <span class="variable">BN_MONT_CTX</span> <span class="variable">*m_ctx</span><span class="operator">));</span>
 
 <span class="regex">/* called at new */</span>
 <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*RSA_meth_get_init</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">)</span> <span class="operator">(</span><span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_init</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*rsa</span><span class="operator">,</span> <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*init</span> <span class="operator">(</span><span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">));</span>
 
 <span class="regex">/* called at free */</span>
 <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*RSA_meth_get_finish</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">))(</span><span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_finish</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*rsa</span><span class="operator">,</span> <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*finish</span><span class="operator">)(</span><span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">));</span>
 
 <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*RSA_meth_get_sign</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">))(</span><span class="keyword">int</span> <span class="variable">type</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*m</span><span class="operator">,</span>
                                                  <span class="variable">unsigned</span> <span class="keyword">int</span> <span class="variable">m_length</span><span class="operator">,</span>
                                                  <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*sigret</span><span class="operator">,</span>
                                                  <span class="variable">unsigned</span> <span class="keyword">int</span> <span class="variable">*siglen</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_sign</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*rsa</span><span class="operator">,</span>
                       <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*sign</span><span class="operator">)(</span><span class="keyword">int</span> <span class="variable">type</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*m</span><span class="operator">,</span>
                                   <span class="variable">unsigned</span> <span class="keyword">int</span> <span class="variable">m_length</span><span class="operator">,</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*sigret</span><span class="operator">,</span>
                                   <span class="variable">unsigned</span> <span class="keyword">int</span> <span class="variable">*siglen</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">));</span>
 
 <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*RSA_meth_get_verify</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">))(</span><span class="keyword">int</span> <span class="variable">dtype</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*m</span><span class="operator">,</span>
                                                    <span class="variable">unsigned</span> <span class="keyword">int</span> <span class="variable">m_length</span><span class="operator">,</span>
                                                    <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*sigbuf</span><span class="operator">,</span>
                                                    <span class="variable">unsigned</span> <span class="keyword">int</span> <span class="variable">siglen</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_verify</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*rsa</span><span class="operator">,</span>
                         <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*verify</span><span class="operator">)(</span><span class="keyword">int</span> <span class="variable">dtype</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*m</span><span class="operator">,</span>
                                       <span class="variable">unsigned</span> <span class="keyword">int</span> <span class="variable">m_length</span><span class="operator">,</span>
                                       <span class="variable">const</span> <span class="variable">unsigned</span> <span class="variable">char</span> <span class="variable">*sigbuf</span><span class="operator">,</span>
                                       <span class="variable">unsigned</span> <span class="keyword">int</span> <span class="variable">siglen</span><span class="operator">,</span> <span class="variable">const</span> <span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">));</span>
 
 <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*RSA_meth_get_keygen</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">))(</span><span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span> <span class="keyword">int</span> <span class="variable">bits</span><span class="operator">,</span> <span class="variable">BIGNUM</span> <span class="variable">*e</span><span class="operator">,</span>
                                                    <span class="variable">BN_GENCB</span> <span class="variable">*cb</span><span class="operator">);</span>
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_keygen</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*rsa</span><span class="operator">,</span>
                         <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*keygen</span><span class="operator">)(</span><span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span> <span class="keyword">int</span> <span class="variable">bits</span><span class="operator">,</span> <span class="variable">BIGNUM</span> <span class="variable">*e</span><span class="operator">,</span>
                                       <span class="variable">BN_GENCB</span> <span class="variable">*cb</span><span class="operator">));</span>
 
 <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*RSA_meth_get_multi_prime_keygen</span><span class="operator">(</span><span class="variable">const</span> <span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">))(</span><span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span> <span class="keyword">int</span> <span class="variable">bits</span><span class="operator">,</span>
                                                                <span class="keyword">int</span> <span class="variable">primes</span><span class="operator">,</span> <span class="variable">BIGNUM</span> <span class="variable">*e</span><span class="operator">,</span>
                                                                <span class="variable">BN_GENCB</span> <span class="variable">*cb</span><span class="operator">);</span>
 
 <span class="keyword">int</span> <span class="variable">RSA_meth_set_multi_prime_keygen</span><span class="operator">(</span><span class="variable">RSA_METHOD</span> <span class="variable">*meth</span><span class="operator">,</span>
                                     <span class="keyword">int</span> <span class="operator">(</span><span class="variable">*keygen</span><span class="operator">)</span> <span class="operator">(</span><span class="variable">RSA</span> <span class="variable">*rsa</span><span class="operator">,</span> <span class="keyword">int</span> <span class="variable">bits</span><span class="operator">,</span>
                                                    <span class="keyword">int</span> <span class="variable">primes</span><span class="operator">,</span> <span class="variable">BIGNUM</span> <span class="variable">*e</span><span class="operator">,</span>
                                                    <span class="variable">BN_GENCB</span> <span class="variable">*cb</span><span class="operator">));</span>
</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>The <b>RSA_METHOD</b> type is a structure used for the provision of custom RSA implementations. It provides a set of functions used by OpenSSL for the implementation of the various RSA capabilities. See the <a href="/man1/rsa.html">rsa</a> page for more information.</p>

<p>RSA_meth_new() creates a new <b>RSA_METHOD</b> structure. It should be given a unique <b>name</b> and a set of <b>flags</b>. The <b>name</b> should be a NULL terminated string, which will be duplicated and stored in the <b>RSA_METHOD</b> object. It is the callers responsibility to free the original string. The flags will be used during the construction of a new <b>RSA</b> object based on this <b>RSA_METHOD</b>. Any new <b>RSA</b> object will have those flags set by default.</p>

<p>RSA_meth_dup() creates a duplicate copy of the <b>RSA_METHOD</b> object passed as a parameter. This might be useful for creating a new <b>RSA_METHOD</b> based on an existing one, but with some differences.</p>

<p>RSA_meth_free() destroys an <b>RSA_METHOD</b> structure and frees up any memory associated with it.</p>

<p>RSA_meth_get0_name() will return a pointer to the name of this RSA_METHOD. This is a pointer to the internal name string and so should not be freed by the caller. RSA_meth_set1_name() sets the name of the RSA_METHOD to <b>name</b>. The string is duplicated and the copy is stored in the RSA_METHOD structure, so the caller remains responsible for freeing the memory associated with the name.</p>

<p>RSA_meth_get_flags() returns the current value of the flags associated with this RSA_METHOD. RSA_meth_set_flags() provides the ability to set these flags.</p>

<p>The functions RSA_meth_get0_app_data() and RSA_meth_set0_app_data() provide the ability to associate implementation specific data with the RSA_METHOD. It is the application&#39;s responsibility to free this data before the RSA_METHOD is freed via a call to RSA_meth_free().</p>

<p>RSA_meth_get_sign() and RSA_meth_set_sign() get and set the function used for creating an RSA signature respectively. This function will be called in response to the application calling RSA_sign(). The parameters for the function have the same meaning as for RSA_sign().</p>

<p>RSA_meth_get_verify() and RSA_meth_set_verify() get and set the function used for verifying an RSA signature respectively. This function will be called in response to the application calling RSA_verify(). The parameters for the function have the same meaning as for RSA_verify().</p>

<p>RSA_meth_get_mod_exp() and RSA_meth_set_mod_exp() get and set the function used for CRT computations.</p>

<p>RSA_meth_get_bn_mod_exp() and RSA_meth_set_bn_mod_exp() get and set the function used for CRT computations, specifically the following value:</p>

<pre><code> r = a ^ p mod m</code></pre>

<p>Both the mod_exp() and bn_mod_exp() functions are called by the default OpenSSL method during encryption, decryption, signing and verification.</p>

<p>RSA_meth_get_init() and RSA_meth_set_init() get and set the function used for creating a new RSA instance respectively. This function will be called in response to the application calling RSA_new() (if the current default RSA_METHOD is this one) or RSA_new_method(). The RSA_new() and RSA_new_method() functions will allocate the memory for the new RSA object, and a pointer to this newly allocated structure will be passed as a parameter to the function. This function may be NULL.</p>

<p>RSA_meth_get_finish() and RSA_meth_set_finish() get and set the function used for destroying an instance of an RSA object respectively. This function will be called in response to the application calling RSA_free(). A pointer to the RSA to be destroyed is passed as a parameter. The destroy function should be used for RSA implementation specific clean up. The memory for the RSA itself should not be freed by this function. This function may be NULL.</p>

<p>RSA_meth_get_keygen() and RSA_meth_set_keygen() get and set the function used for generating a new RSA key pair respectively. This function will be called in response to the application calling RSA_generate_key_ex(). The parameter for the function has the same meaning as for RSA_generate_key_ex().</p>

<p>RSA_meth_get_multi_prime_keygen() and RSA_meth_set_multi_prime_keygen() get and set the function used for generating a new multi-prime RSA key pair respectively. This function will be called in response to the application calling RSA_generate_multi_prime_key(). The parameter for the function has the same meaning as for RSA_generate_multi_prime_key().</p>

<p>RSA_meth_get_pub_enc(), RSA_meth_set_pub_enc(), RSA_meth_get_pub_dec(), RSA_meth_set_pub_dec(), RSA_meth_get_priv_enc(), RSA_meth_set_priv_enc(), RSA_meth_get_priv_dec(), RSA_meth_set_priv_dec() get and set the functions used for public and private key encryption and decryption. These functions will be called in response to the application calling RSA_public_encrypt(), RSA_private_decrypt(), RSA_private_encrypt() and RSA_public_decrypt() and take the same parameters as those.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>RSA_meth_new() and RSA_meth_dup() return the newly allocated RSA_METHOD object or NULL on failure.</p>

<p>RSA_meth_get0_name() and RSA_meth_get_flags() return the name and flags associated with the RSA_METHOD respectively.</p>

<p>All other RSA_meth_get_*() functions return the appropriate function pointer that has been set in the RSA_METHOD, or NULL if no such pointer has yet been set.</p>

<p>RSA_meth_set1_name and all RSA_meth_set_*() functions return 1 on success or 0 on failure.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man3/RSA_new.html">RSA_new(3)</a>, <a href="../man3/RSA_generate_key_ex.html">RSA_generate_key_ex(3)</a>, <a href="../man3/RSA_sign.html">RSA_sign(3)</a>, <a href="../man3/RSA_set_method.html">RSA_set_method(3)</a>, <a href="../man3/RSA_size.html">RSA_size(3)</a>, <a href="../man3/RSA_get0_key.html">RSA_get0_key(3)</a>, <a href="../man3/RSA_generate_multi_prime_key.html">RSA_generate_multi_prime_key(3)</a></p>

<h1 id="HISTORY">HISTORY</h1>

<p>RSA_meth_get_multi_prime_keygen() and RSA_meth_set_multi_prime_keygen() were added in OpenSSL 1.1.1.</p>

<p>Other functions described here were added in OpenSSL 1.1.0.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


</body>

</html>


